After installing dual CP3s, I noticed on my truck that rail pressure was kind of jumpy at higher fuel quantities and RPMs. I thought it had something to do with my kit not being a mass produced kit, but today I was doing some logging on another truck that does have a mass produced kit that was doing the same thing. I originally had the stock B1015, and I modified it a little to try to fix it. Didn't really do much other than make it lose rail pressure a little. Is this normal?
Dual CP3 rail pressure question
- Thread starter JoshH
- Start date
Is this the LBZ?
Try adjusting fuel pressure parameters B1018 and B1019.
LLY
B1008 and B1009
Duty 99 and 1 respectively.
Otherwise, adjusting the large adjustment would be in order depending on response time in the log. Post a picture if you could.
Try adjusting fuel pressure parameters B1018 and B1019.
LLY
B1008 and B1009
Duty 99 and 1 respectively.
Otherwise, adjusting the large adjustment would be in order depending on response time in the log. Post a picture if you could.
Last edited:
What table is that in lb7s? I dont have EFI on this computer?
or even whats the desciption?
Attachments
Yes, it is on an LBZ, and thanks, I'll give that a try. What will that adjustment do? It's set at 95 and 5 now.
That sure looks like a rail pressure regulator chattering? But, try the large pressure compensation to be sure as well as large time compensation B1017 which you may want to slow down.
Edit: Being an LBZ, B1015 would be your best bet. Also, monitor you rail temperatures.
Edit: Being an LBZ, B1015 would be your best bet. Also, monitor you rail temperatures.
Last edited:
99 will help cut the fuel off, and give more control on volume for idle.
1 will open fully but, you may not need this if you have stock injectors and can hold rail. Usually not if a lift pump is feeding the cp3's.
I don't see a B1017 anywhere in my tune. What is "regulator chattering"?
My OS is 3624, but the other truck I saw was acting very similar and is OS 6128. Here's a pic from one of the logs from it.
Attachments
Last edited:
I don't see a B1017 anywhere in my tune. What is "regulator chattering"?
My OS is 3624, but the other truck I saw was acting very similar and is OS 6128. Here's a pic from one of the logs from it.
You have a PM.
I have had the same problem on my truck for about 3 years now? Did you fix the problem, I still havent figured mine out. I have one stock cp3 and the other one has a modded SD fuel pressure regulator.